Typewriting machine



1945- c. WALKER ET AL 2,369,6

TYPEWRITING MACHINE Filed Feb. 9, 1945 4 Sheets-Sheet 1 F2 Fig. 1

2 Cfiarles ll/alker Z(/L'1laral H. [Mzac INYENTORS TYPEWRITING MACHINE Filed Feb. 9, 1943 4 Sheets-Sheet 2 n m Charles ZI/a/ker s ll/zllarz/ f1. ll/ad:

Feb. 20, 1945.

c. WALKER ET AL 2,369,695

TYPEWRITING MACHINE Filed Feb. 9, 1943 4 Sheets-Sheet 3 H. ade

1% ar INVENTORS an f4 Wz:

ATTORNEY TYPEWRITING MACHINE Filed Feb. 9, 1943 4 Sheets-Sheet 4 Patented Feb. 20, 1945 Charles Walker, Syracuse, N. Y., and Willard Wade, Washington, D. 0., assignors. to L. C. Smith & Corona'Typewriters, Inc., Syracuse, N. Y., a corporation of New York Application February 9, 1943, Serial No. 475,264

Claims.

-The invention relates to improvements in typewriting'machines, and its general purposes are to provide improved power means for effecting actuation of a reciprocal operation-effecting ele-, ment of such machines, and toprovide improved keyecontrolled means whereby movements of an element of such machines from and back we normal idle position may be effected by force;

other than that exerted by the typist on one or more control keys of said means.

.Whilethe invention is particularly adaptedfor embodiment in case changing mechanisms for typewriting machines, anda preferred 'embodiment of the invention wherein case changing movements ofa type bar segment of a typewriting machineare effected at will is illustrated in Y the accompanying drawings forming a part of thisspecification, it will be obvious to those skilled in the art that the invention, in its broader. aspects, may be employed for eifecting movement of other elements of a typewriting machine from and to a normal idle position by power other than that exerted ona control device, whether said element be movable for case changing or for other purposes.

Particular objects of the invention are to provide an improved case changing mechanism for typ'ewriting machines, and to provide a case changing mechanism wherein movement of the case-changing shiftable support (such as a type .bar' segment) to a normal position for lower case typingis effected by spring power, and movement of said support to a position for upper case typing is effected by gravitational force, power derived from a rotary motor or shaft being utilized to free the case-changing support from the influence of the spring power and also, preferably, to release a locking device normally locking the support in itsnormal position for lower ,case typing.

Figure 2 is a fragmentary vertical longitudinal sectional view offthe machine taken ap-. proximately on the line 2 2 of Figure 1,'the parts I being positioned for normal lower case typing.

A further object of the invention is to provide, 0

improved means for controlling a power casechangingmechanism by means of two temporary shift keys and a shift-lock key.

,Other objects and advantages of the invention will appear from the following description of the illustrative embodiment thereof shown in the accompanying drawings. r

In the drawings} Figure 1 is ,a top planview of a typewriting machine equipped with a case shift mechanism embodying the invention, certain parts of the machine being omitted and others hroken away for greater clarity of illustration of the caseshift mechanism. W Y I M f Figure 3is a view similar. toFigure 2 showing the machine conditioned for upper case typing with the left hand one of the two temporary shift keys of the machine held depressed.

Figure 4 is a fragmentary sectional view similar "to Figure 3 but showing the shift lock, key

latched in depressed position.

Figure 5 i a detail view partly in horizontal section approximately on lin 5 -5 of Figure v2.

Figure 6 is a fragmentary sectional view taken on the same line as Figures 2 and 3, but showing the parts as in action during downward shifting of the type bar segment from its normal position for lower case typing to its shifted position for upper case typing.

l The drawings illustrate the invention as em bodied in a case shiftmechanism for a typewriting machine, such as the known L C Smith typewriter, having a platen carriage and an upwardly and rearwardly inclined type bar segment, which segment is constructed and is, shiftably mounted in the framework of the machine, substantially as shown, fOr example, in United States patents to Gabrielson numbered 983,490, 1,018,968, 1,032,131 and 2,028,200, for downward movement of the segment relatively to the carriage from a normalposition conditioning the machine for lower case typing into a lower shifted position conditioning the machine for upper case typing.

The machine ha a suitable stationary main framework 10 upon which the usual platen carriage 'H is mounted in the usual manner for travel back and forth transversely of the machine, and the usual roller platen I2 is journaled in said carriage, The usual type bar segment l3 supports the usual arcuate set or system of upwardly and rearwardly swingable typ bars 14, each type bar having a pivotal connection IS with the segment and also bearing a lower case type i6 and an upper case type l1, only type bars being shown.

The. type bar segmenpl3- is supported and guidedin the main framework [0 by means constructed and arranged substantially as disclosed in the aforesaid patents, for down and up casechanging movement of the segment respectively from andto its normal position for lower case typing. Said supportingandguidingmeans com-1 prises two racewaymembers l8- fixedly held-to opposite ends of the segment [3, two raceway members!!! fixed on the framework In adjacent afew of said.

opposite sides of the machine and opposed to members l8 to provide two upwardly and rearwardly inclined ball races. two bearing balls 43, one in each of said races, a horizontal rock shaft 20 extending transversely of the machine and journaled at its ends on pivots 49 held to framework I0, and a pair of normally forwardly and upwardly extending rock arms 2! (Figure 1) fixed on shaft 20 and pivotally connected at their forward ends to segment 13 by horizontal pivots 22 extending transversely of the machine,

The normal elevated position of the segment for lower case typing and the shifted or lowered position of the segment for upper case typing are determined by case shift stop means adjustable to Vary each of said positions independently of the other and constructed substantially as shown in Patent No. 2,028,200 previously referred to. This adjustable stop means, as shown, comprises a stop screw 88 pendent from the segment l3 and variably screwable thereinto to adjust the head of the screw relatively to the segment. The shank of this screw extends loosely through an aperture 88 in a fixed stop part 10a of the framework I against the under face of which part [a the head of said screw is engageable to determine the position ofthe segment for lower case typing. Above part Illa a stop, comprising a nut 90, is crewable up and down on the shank of screw 88 for adjustment relatively to the segment and is engageable with. the upper face or stop part lfla to determine the position of the segment for upper case typing.

The improved means shown in the drawings whereby case changing movements of the segment may be effected at the will of the typist will now be described.

The shaft has fixed thereto adjacent the left hand side of the machine a rock arm 23 which normally extends upward and forward from said shaft. A plate 24, adjustable about shaft 20 and located at the left hand side of rock arm 23, is clamped in adjusted position to said arm, to rock therewith, by means of a clamping screw 25 which is threaded into said arm with its shank extending through a clearance slot 241; in the plate, said plate being pivoted on shaft 20 by a forked portion 24a of the plate, the tines of which forked portion are engaged in an annular groove in the shaft. Plate 24 extends above arm 23 and has fixed to its upper portion a horizontal stud 26 which projects from the plate toward the adjacent left hand side of the machine.

Preferably there is provided a normally straightened locking toggle for normally releasl .age pivot element 30 which is fixed on framework 10 and extends horizontally transversely of the machine, and the rear link 28 is pivotally anchored to the above described stud 26, which stud erves as the movable anchorage of the toggle and. is also adjustable, as above explained, by adjustment of plate 2t. The front link 2'! of said toggle is formed adjacent its rear end with a rearwardly extending stop finger 32 which is permanently adjustably bendableup and down for engagement of said finger over a stop 33 fixed on the rear link 28 between the toggle hinge 29 and toggle anchor 26 to permit upward breaking or straightened or extended condition. Preferably,

a light pull spring 3| is connected at its forward end to framework 10 and at its rear end to toggle link 21 forward of the toggle anchor 30 to aid in full straightening of the toggle 2'l-28 and to yieldingly resist upward breaking or collapsing of the toggle. When the toggle 21-28 is broken or psed slightly by a camming action on the toggle hinge pivot 29' of a cam edge 34 on a link 35, upon initial forward movement of link 35, as hereinafter described, the segment I3 i freed or released from the locking restraint of said toggle.

The improved means shown in the drawings whereby downward shifting of the segment by the force of gravity into its lower position for conditioning the machine for upper case typing and whereby restoration of the shifted segment to normal position by spring force, are brought about at the will of the operator, will now be described.

Movement of the segment [3 downward by gravitational force into its position for conditioning the machine for upper case typing is brought about by motor driven forward movement of a reciprocal case-change-effecting link or bar 35 from a normal spring-returned position of said bar, and rearward movement of said link or bar to the normal position thereof by a power spring 43 brings about restoration of the segment to'its normal elevated position for conditioning the machine for lower case typing.

The link orbar extends fore and aft of the machine adjacent the left hand side of the machine and is supported for reciprocation thereof substantially endwise. The link is made in two sections connected for relative longitudinal adjustment therebetween to vary the length of the link, said link sections being clamped together in adjusted relation by means of clamping screws 9| threaded in one section and extending through longitudinal slots 92 in the other section. Adjacent its forward end the link 35 is slidably supported and guided by the toggle anchor stud 26 1 carried by plate 24, said stud extending through a longitudinal guide slot 36 in the link 35. The hinge pivot 29 of toggle 2128 projects toward the right hand side of the machine and is nor mally located over, and preferably slightly spaced above, the forward portion of a downwardly and forwardly inclined cam edge 34 formed on link 35 at the upper edge of the link adjacent the forward end of the link. A slight initial forward movement of link 35 will cause cam edge 34 to move the toggle hinge pivot 29 upward slightly to initially break the toggle and release the segment. As the released segment drops, the toggle will continue to collapse. At its rear end the link 35 is connected to th upper end of the upstanding arm 38 of a threearm lever 3840-M by a horizontal pivot 31' which extends transversely of the machine. Said lever is formed with a hub 39 from which its arms extend, the arm 40 extending forwardly and the arm 4! extending rearwardly from the hub 39.

part of framework l0 and is stationarily held t'of said frame part. I 1

A power, shaft 42, which extends horizontally transversely of the machine adjacent the rear" end, of the .machine, is iournaledin sleeve. l3l and is'als'o journaled' in framework H] at I32; While the machine is in use, this power shaft 42 is constantly rotatively driven clockwise (as viewed in Figures 21, 3 'and 6) by a rotary electric motor 62 whichis suitably mounted on (framework 1! and drives said shaft through suitable speed-reducing driving means 63, the motor being constantly energized while the machine is in use.

Power for restoring the segment l3; the parts supported thereby, and. the link-35 and lever 38 39--40-4l to their respective normal positions and yieldingly holding them there is afforded by a constantly tensioned power sp-ring,,namely, the 'pull spring 43. This spring is anchoredai. its forward end to the rear section Oflink 35 and is anchored at its rear end to the forward end of a bolt 45. 'This bolt is longitudinally slidable fore and aft of the machine through a guide aperture in a part of framework l0, and" there-is threaded on this bolt a nut 43 which abuts the rear face of said apertured partof the framework. By screwing this nut along the bolt the normal tension of spring 43 may be varied.' Concomitant return movements of the 52, 54 and 55 extend horizontally transversely of link 35, and, of the three-arm. lever 38-39- I 40 4i connected therewith, are arrested by engagement of a pin 65 on the rearwardly ex tending arm 4| of the lever with the upper side of an upand down adjustable stop lug 93 formed on a part of the framework It]. Pin65 extends horizontally transversely of the machine. 7 and the 'stop' lug 93 is ermanently adjustablyv bendable .up and down for regulation of the normal position of the link 35 and of the threearm lever. p

. Means, hereinafter described, are provided for moving both the three-arm lever and the link or bar 35 a predetermined extent from their respective' normal positions in opposition to thepower of spring 43 by power derived from the above-mentioned constantly rotating shaft 42, the extent of the forward-movement of the link being preferably greater, as shown in Figure 3, than that necessary to permit the segment 13 to drop under the influence-of gravity until arrested by engagement of stop with the-framesto part lfl a. In the normal position of link 35, the forward end wall of slot 36 engages the stud 26, but in the fall forwardly shifted position of link',3-5, the forward end wall of slot 36 is preferably Spaced forwardly more or less from;

stud 26 as shown in Figure 3. In returning to normal position under pull of spring 43, the link pulls on stud 26 until theupward movement of the segment I3 is arrested by engagement of the head of stop screw 88 with stop frame part 1 Illa, which engagementoccurs at the limit of return or rearward 'movement of link 35 determined' by engagement of pin with the adjustable frame stop 93. Stud 26 nd slot 36 providea one-way power transmitting ,connec* tion, between the link 35 and the segment for lifting the segment, I

A second, and normally broken or collapsed, toggle is'provided. for releasably latching or looking the link 35 and-the three-arm lever 353-949- 40-4l against return movement by the power spring43 from the aforesaid predetermined limit I ofshifted movement thereof out of normal posilever arrive at their predetermined shifted limits Y from normal position. The toggle comprises an fully straightened" I said rack to drive the rack in e 1 impart the previously described predetermined 'lapsing of the toggle.

the machine.

is preferably provided to aid in fully straighten-- ing toggle 51-53 and to yieldingly resist breaking of the toggle. This toggle is normally col lapsed or broken rearwardly, and the link 5i of:

the toggle is provided with a stop finger 51 which is permanently adjustably bendable toward and from a stop 58 fixed on toggle link 53, which finger-51 engages said stop 58 when the toggle is fully straightened and prevents forward col- Means, which will now be described, are providedfor imparting, at the will of the typist, the aforesaid predetermined throw to the threearmed lever 38-40-4I and the. connected link or bar 35 from normal position to shifted position by power derived from shaft 42 for effecting conditioning of the machine for upper case typing,'and for thereafter effecting, atthe will of the typist, release of said, connecting link and IBVQI'lIOlH thelocking action of the toggle 5l--53 to permit restoration of said link and lever and the segment [3 to normal position by the power spring 43 for conditioning the machine for lower case typing. Shaft 42 .is connectible by the followingpowerdriven means with the three-arm lever, to first impart the aforesaid predetermined movement to said lever and the connected link 35 and permit automatic locking of the lever and link in shifted position by toggle 5l53, and to there-,

upon leave said lever and link free to be restoredto normal position by power spring 43 when said link and lever are released from the locking action thereonof the toggle 5l53.

The just-mentioned power-driven means com prises a mutilated pinion 66, a single-revolution clutchffor connecting said pinionto shaft 42 for a single driven revolution of the pinion, and a vibrative or reciprocal rack 41 which is connected to the three-arm lever, these parts being ar ranged to effect, during each revolution of the pinion, automatic engagement ofthe pinion with one direction to throw from normal position to the lever, automatic disengagement of said pinion from the rack, and arrest of the pinion in a normal position in which no teeth of the pinion are in the path of movement of the teeth of the rack. Pref erably, means are provided for positively releasably locking the pinion in its normal arrested position.

In the construction shown, the vibrative or reciprocal rack 41 is a segment rack journaled on a horizontal pivot 64 which is fixedly held to framework behind shaft 42 and extends parallel to 7 said shaft'said' rack being formed with anoperupp r link 5| pivoted .on an anchor. pivot screw Anchor pivot 52 is fixed to a vertically adjustable plate 94 provided with aligned a slot 41a (Figures and 6) which is radial to the pivot 64 and in'which is engaged the previously described horizontal pin or stud 65 fixed on, and extending transversely of the machine from, the arm 4! of the three-arm lever. The rack is thus also movable by sprin g 43 to a normal position determined by engagement of stud 65 with stop 93, and driving of the rack by multilated pinion 66 from said normal position im-' parts the previously mentioned predetermined throw from normal position of the three-arm lever and the link 35.

The mutilated gear or pinion 6B is loosely journaled on shaft 42 in front of the segment rack 4! and ha fixed on its hub a short arm 9! to which a dog-carrying plate 61 is positively held by suitable means to rotate with the pinion 86. In the construction shown, the dog-carrier or plate 61 is loosely journaled on a suitable spacing collar on the pinion hub and is positively held to arm 91 by a, rivet 98, so that the dog car rier rotates in unison with the multilated pinion.

The single-revolution clutch above referred to includes a driving clutch element or ratchet wheel 68 which is fixed on shaft 42, and a driven clutch element or clutch dog 69 which is pivoted on the dog-carrier 61 at In for swinging of said dog into and out of engagement with said ratchet Wheel. A torsion spring H (Figure 6) is engaged with the dog and dog-carrier to urge the dog into engagement with the toothed periphery of the ratchet wheel for driving of the multilated pinion by the ratchet in clockwise direction as the parts are viewed in Figures 2, 3 and 6. The clutch is thus constantly biased to close for driving the mutilated pinion.

The normal position of the segment rack A! is determined, as above explained, by engagement of pin .65 with the adjustable stop 93. The normal arrested position of the mutilated pinion 66 and the dog-carrier is determined by releasable latch means a part of which also controls throwing of the clutch dog into and out of engagement with the ratchet wheel and normally hold the clutch dog from engagement with the ratchet wheel. This latch means comprises a latch lever 12 'l3l4 fulcrumed. on a horizontal pivot 15 on framework II], which pivot extends transversely of the machine below shaft 42 and pinion 66 and the .dog-carrier. The lever 121314 is formed with a stop finger 16 which is permanently adjustably bendable fOre and aft of the machine and is normally urged forward against a stop portion ll of framework H) by a return spring 13 to determine the normal position of said lever and thereby determine also the normal position of the multilated pinion 66 and dog-carrier 61. Spring 18 is anchored to arm T3 of said lever and to a control bar or tappet H0 hereinafter described. Arm 12 of said lever is formed with a laterally bent stop lug l9 which normally is interposed in the path of driven movementof the dog-carrier 6'1 and is normally engaged by said carrier. The clutch dog 69 has a tail piece 69a which, following a clutching engagement of the dog with the ratchet wheel 68, is adapted to engage against lug l9 slightly before the dog-carrier engages said lug and to bring about a rocking of the dog on its pivot to move the nose of the dog out of engagement with the teeth of the ratchet wheel at the end of a single revolution of the multilated pinion and thereafter hold the clutch elements 68-69 disengaged until lever l2-'l3--l4 is again rocked to again release the dog carrier and dog. Lever 12. -13--'l4 thus also serves as a clutch control lever for the clutch To prevent the dog spring H from reversely rotating the dog-carrier and pinion, after arrest of the dog-carrier and disengagement of the dog from the ratchet wheel, and to prevent possible accidental reverse rotation of the dog-carrier and pinion from normal position, there is loosely pivoted on the previously mentioned pivot 15 a latch arm 80 which is normallyurged by a spring 8| against a stop lug 82 on arm 12 of the lever l2-13l4 into a position for closely confining a part of the dog-carrier between the free end of said latch arm 80 and the lug 19 on thelever 12-43-44. Spring BI i anchored to latch arm 80 and to arm 12 of the lever 12--l3--74 and, as the dog-carrier nears the end of each revolution thereof, said dog-carrier engages and rocks arm 80 out of the way of the dog-carrier until the free end of the arm 80 snaps behind the part of the dog-carrier which abuts lug 19. Arm 80 does not engage the tail 69a of the clutch dog 69.

It will be observed that the motor, clutch and multilated pinion are normally ineffective to drive the rack 41 notwithstanding the fact that the motor is constantly running while the machine is in use.

The following case-selecting means are provided for controlling, at the will of the typist, the shifting from normal position and the restoration to normal position of bar 35, lever 38--4ll-4| and rack 4'! by the above described electric motor actuated mechanism and the power spring 43 and thereby, in the construction shown, effecting a ravity shift of the type bar segment l3 into its position conditioning the machine for upper case typingand spring restoration of the segment to its normal position conditioning the machine for lower case typing.

A straight fulcrum rod I00, which extends horizontally transversely of the machine, is fixed on framework l0 below the forward ends of the type bars M of the system of type bars with said rod crossing a series of slots llll formed in a part of the framework. This fulcrum rod preferably is the fulcrum rod for the type key levers of keycontrolled power-actuated type bar actions for the type bars M, which actions are preferably constructedand operate as disclosed in the copending application for United States patent of Charles Walker, Serial No. 466,989, filed November 26, 1942.

A spring-returned tappet-actuating lever l02-|02a is fulcrumed on rod I00 adjacent the left hand side of the machine. Also fulcrumed on said rod adjacent opposite sides of the machine are two temporary shift key levers I03, the left hand one of which is located close to, and at the right hand side of, the tappet-actuating lever l02l02a. Also fulcrumed on said rod close to, and at the left hand side of the tappetactuating lever, is a shift lock key lever I04. Each of said three key levers and said tappetactuating lever is yieldingly held in normal position by a different one of a series of four return springs 105, each spring being anchored to the framework Ill and its associated lever. Each of these four levers is provided with a return stop lug I06, each of which lugs is permanently adjustably bendable fore and aft of the machine relatively to the lever on which it is formed and is normally yieldingly held pressed forward against a stop device I01 which extends horizonkey levers is guided at its rear end in a different one of the slots IBI inthe framework I9 and is up-and-down movement of said toggle anchor also guided intermediate its'rear end and its forl ward key-carrying end inadiiferent oneof a series of vertical guide slots I08 in a straight key lever guide comb I09 Which extends horizontally transversely of the machine and is fixedly held to framework IS. The tappet-actuating lever IIl2I32a has an up-and-down extending arm I021 fulcrumed at its upper end on rod I00 and guided in one of theaforesaid'slotsIIlI in framework Ill, and said lever also has an arm I92 extending forwardly from arm IilZa and guided intermediate its ends inone of the slots I08in comb I09. Rocking of the tappet-actuating lever I02I02a from normal position is limited'by engagement of a lug I021) on arm I02 of saidlever with the closed lower end of the guide slot I08 provided for said lever in comb I89. Depression of either of the three shift key levers is limited by arrest of downward movement of arm' I 32 of lever I02-I02a as-will be apparent from the following description.

, The tappet-actuating lever Ill2- -lIl2a is rock able to reciprocate fore-and-aft of the machine a bar-like tappet I I0 which'extends fore-and-aft of 'the machine. This tappet bar IHJ has its forward endpivoted to the lower end of arm IeZa/of lever -lll2-lll2aby a horizontal pivot III which 7 extends transversely of the machine. The lower portion of arm 'IIlZa is permanently adjustably bendable fore and aft of the machine. The tappet bar I'Ill is guided adjacent its rear end in a vertical guide slot 11a in the previously mentioned part ll of framework Ill, and is normally, yieldingly held rocked about its pivot I I I against the closed upper end of said slot 'I'la by the previously mentioned return spring I3 for the clutch-controlling and dog-carrier-latching lever I2'I3--'I4. Spring 18 is anchored at its upper end to arm 13 of said lever 'i2--I3 'I4 and is anchored at its lower end to the rear end of the v tappet bar H0. I

The tappet H0 is formed at its upper side and adjacent its rear end with an upwardly extending and rearwardly facing shoulder I I2 and with an upwardly} extending and forwardly facing shoulder H3. The tappet, in all positions thereof, remains engaged in slot Ila, and, in all posi tions of the tappet, the shoulder I I2 remains'in rear of frame part1! and'the shoulder H3 re:

" mally spaced forward from the hingejoint of said toggle 5I53 and is adapted to be disposed, when said. toggleis in straightened locking condition,

directly and closely in front of the pivotally connected ends of the toggle links in front of toggle hinge pivot 54. The lever H4 is rockable about pivot 'forev and aft of the machine and is fmovableup and down "substantially endwiseby the" pivot 55, which pivot-is carried, as above describedJoy arm 40 of lever 38-40- -4I. The lower arm; ofthe tappet lever H4 is guided in a foreand-aft extending slot I I5 in a part I I6 of framework IO, and is normally yieldingly held against the closed rear end of said slot by a return spring I I! anchoredto said arm and to an extension 39a of lever 38394Il4|.

Upon rearward movement of tappet bar I II] by lever' Hit-Ulla, the lever 12-13-44 is rocked by shoulder Il2 out of the path of travel of the dog-carrier 61 and clutch dog 69 to permit en-. gagement' of clutch elements 68 and 69 by the action of spring II on-clutch dog 69. At the limit of rearward movement of tappet bar H0 determined by arrest of lever Ill2-Ill2a by the means previously described, and the limit of ensuing downward endwise movement of tappet lever I I4 by the clutch driven parts,the shoulder H3 on the tappet bar H9 is located behind and close to'lug ma on leverIM, and the tappet barI IIlis'held rocked down about its pivot II I by lever" H4 against the pull of spring I8, with shoulder H2 out of the path of movement of lug 14a on control lever 12-43-14, as shown in Fig- It will be obvio-usthatthe bar 35, the lever 3&'-'4I34 I, the segment rack'4'I-'-4la and tappet lever H4, when driven by the'motor 62 into the position shown in Figure 3, cannot be restored by spring 43 to the position sho'wnin Figure 2, until the then straightened toggle 5I 53 is broken. It will also be obvious that, with the said power-actuatable parts 35, 38-'-39-4Il4I, 4'l tl'a and H4 fully shifted as in Figure 3,forward movement of tappet III! by spring return of its actuating lever Ifl2lil2a' by'its return spring H15 will causerocking of tappet lever H4 on its pivot 55 by shoulder H3, thus causing lug II4b on lever II4 to thrust rearward against the pivotally connected ends of the links of toggle 5I- -53 adjacent the toggle hinge pivot 54 to impart an initial collapsing movement to'toggle 5I-53 and thereby permit spring 3 to restore the said poWer-actuatable parts to normal position and restore the segment I3 to its position conditioning the machine for lower case typing. Upon such return movement of actuating lever IIlZ-e-IllZa (whenever brought about), the tappet lever H4 will be restored to norrnalposition and the tappet I Ii] will resume its normal position.

it will also be obvious that the mutilated pinion and the reciprocal segment rack 41 provides an automatic make-and-break operating connection between the driven elementfiil of the single revolution clutch 'B869 and the said motorshiftable and spring returned bar 35, lever 38- 3-4il'-'4I, and tappetlever I I4, which operating connectionis established shortly following engagement of the clutch elements, is maintained during a predetermined portion oi each revolution of the clutch suflicient'to impart a predetermined shift'to said parts; and'is thereupon automatically broken before the completion of the clutch revolution and remains broken until the cluth elements are again engaged for another revolution.

It will also be observedthat, while said operating connection is broken, the motor-shifted segment rack 41, the lever 38-3940-4I, lever H4 and bar 35 are free to be returned by power spring 43 from their shifted position whenever released from locking action of toggle 5I- 53, so that no actuation of the clutch 8869 is required to bring about restoration of said rack, levers and bar, but that a mere preliminary breaking of toggle 5I-53 from fully straightened condition by rocking of tappet lever I I4 by forward movement of tappet bar H is sufficient to permit spring 43 to effect such restoration with a concomitant restoration of the type bar segment I3 to its normal position.

It will also be noted that the throw impartive prevents any possibility of the mechanism obstructing full gravitation of the segment into its position conditioning the machine for upper case typ The spring-returned lever I02--I02a for actuating tappet I I0 is, in turn, operable by springreturned tappet means against the resistance of the return spring I05 for said lever. An oscillative and spring-returned tappet device I IBI I9- II2II22I23 is operable upon arm I02 of lever I02-I02a to so rock said lever, said device being operable against the resistance of a return spring I24 by either of the temporary shift key levers I03 through a tappet action of either of said key levers on said device. The spring-returned tappet-actuating lever I02-I02a is also directly operable by a tappet action of shift lock key lever I04, thereon.

The said spring-returned oscillative tappet device comprises a horizontal rock shaft II8 journaled in framework I0 and extending transversely of the machine adjacent the front ends of both of the key levers I03 and the front end of framework I0, two rearwardly extending rock arms I I9 and I20 fixed on said shaft adjacent opposite sides of the machine, a horizontal pin I2I fixed to the rear end of the left hand arm H9 and extending transversely of the machine over the forward end of arm I02 of lever I02-I02a and under the for- V ward end of the left hand one of the-key levers I03, a horizontal pin I22 fixed to the rear end of the right hand arm I20 and extending transversely of the machine under the forward end of the right hand one of the key levers I03, and a pendent rock arm I23 fixed on shaft H8. The return spring I24 for this oscillative tappet device serves also as a return spring for a pivoted latch I25 for the shift lock key lever I04, said spring being anchored at its opposite ends to arm I23 and latch I25. The pins I2I and I22 are normally urged upward against the under edges of their associated key levers I03 by spring I24. Depression of the key of either key lever I03 will rock the oscillative tappet device to thereby rock lever I02--I02a and move tappet bar IIO rearward to trip the clutch control lever I2-13'I4 to effect engagement of clutch elements 68 and 69, without movement of the other key lever I03 or of the key lever I04. Upon release of pressure on said depressed key, the bar IIO will resume normal position and, during its forward springmediate its key IBM and the fulcrum of the key lever, with a. laterally extending tappet lug I26 normally engaged over arm I02 of lever I02-I02a for direct rocking of lever I02-I02a by key .le

Ver I04 with a tappet action to actuate tappet "of either key lever I03 on said device.

IIO to trip clutch control lever l2--I3'I4 without movement of either of the shift key levers I03 and without movement of. the oscillative tappet device II8--II9--I20-I2I--I22- -I23.

The pivoted latch I25 for key lever I04 is pivoted at I30 on the framework I0, to rock about a horizontal axis extending transversely of the machine, and has an upstanding locking arm I21 formed at its upper end with a rearwardly projecting lug I21a, the rear edge of which lug is normally held yieldingly pressed rearward against the front edge of a laterally extending lug I28, which lug I28 is formed on key lever I04 between its key and fulcrum and is permanently adjustably bendable up and down. Latch I25 is also formed with a forwardly extend- -ing latch releasing arm I29 which extends under pin I2I on arm I I 9 of the oscillative tappet device and is normally spaced from said pin below the point to which the pin is depressible by the action Upon full depression of key I04a the latch is rocked by spring I24 to engage lug I2'Ia over lug I28 on key lever I04 and latch said key lever down in its fully rocked position against return by its spring I05 when the typist releases key I04a. Depression and latching down of key lever I04 brings about a change of position of type bar segment I3 which conditions the machine for upper case typing and also prevents restoration of said segment to normal position until latch I25 is released. Release of latch I25 and resultant restoration of the segment I3 to normal position may be thereafter effected by depression and release of either of the shift keys I03a. In the latched position of key lever I04 (shown in Figure 4) it will be observed that releasing arm I29 of latch I25 has been car'- ried up (by rocking of the latch into latching position) into the field of downward movement of pin I.2I of the oscillative tappet device, so that rocking of the latter device by depression of either of the keys I 03a will cause said pin I2 I to depress latch release arm I29 and thereby rock the latch I25 to release the key lever I04 which will immediately rise to normal position under the infiuence of its return spring I05. As soon as the key I03a, depressed to release the latch, is itself released, this key and its lever I03 will rise to normal position and the latch I25 and the oscillative tappet device will be restored to normal position by spring I24. Restoration of key I04a and its lever I04 to normal position likewise permits restoration of lever I02I02a and tappet IIO to normal-position, with resultant restoration of the type bar segment I3 to normal position in the manner hereinbefor explained.

To reduce the power required to lift the segment I3 and to thus avoid the necessity of using a very strong spring 43, reduce the motor power required to advance the link 35, and reduce shock and noise and wear in operation of the case shift mechanism, a counterbalance spring I33 is preferably provided for counterbalancing the, major portion of the weight of the segment I3. and of thev parts mounted thereon. This spring I33 is anchored at its forward end to a stud on plate 24 maining in the position thereof and is anchored at its rear endtolthe forward end of a. bolt I34. Bolt I34 is slidable'endwise through a guide aperture in apartof framework I0, and'a nut I35 is threadedon the rear end of the bolt and abuts the rearface of this frame part. ,By screwing nut I35 along the bolt, the-normal tension of the .counterbalancing spring I33 may be varied. y

To prevent possible mal-operationof the case shift mechanism by a staccato blow on either of the temporary shiftkeys ordepression and inmally, held yieldingly urged upward against the closed upper end of guide slot 11a by alight spring I40 which isconnected to said latch and to bar III]. Adjacentits free rear end, said latch is formed with a pendent stop lug I39. which is bent laterally at its lower end to underlie, the lower edge of bar IIIl at a point spaced slightly below said edge in the normal position of bar HI] and latch I38; Upon rearward movement of bar IIt far enough to trip the single-revolution clutch device, the latch rocks upward to engage lug I38 against the under side of bar H9 and engage lug I38 against therear face of the slotted part 1! to latch bar Ill] and lever IIJ2-IB2a in actuated olutionclutch having normally disconnected driving 'and driven "elements, means for constantly rotating the driving element of the clutch while the machine is in use, a normally broken operat' ingconnection'between said reciprocal element andthe driven element'of the clutch automatically temporarily connectible once during: each position until lever H4 descends and rocks bar IID downward, whereupon the latch I will: be carried bodily downward with the bar to release the latch as shown in Figures 3 and 6. If the depressed temporary shift key has already been released, parts H0 and NIL-102a will now assume normal position and actuate the toggle-unlocking lever I It to bring about restoration of the segment to normal lower case position. lnthe absence of the latch I38, it mi-ght'be' possible,

upon an unusually rapid and abnormal operation of either ofthe temporary shift keys, for the key to. return before descent of lever I M, which would result in the segment moving to andrewhich conditions the machine for upper casetyping. Thelatch I33 and bar II] exten'd through the-guide slot Tia in all positions of said latch and said bar.

' We claim:

revolution of the driven clutch element to move,

said reciprocal element from its normal position, means operable upon depression of said control key to efiect engagementof the driving and driven elements ofthe clutch for a single revolution only, latching'means automatically operable to latch said reciprocal element in its shifted position, and means controlled by return movement of said key to operate upon said latching means to free said element for automatic restoration of the latter to the normal position into which it is biased to move.

-3."-In a typewriting machine having an operation-effecting element oppositely movable from and back to a normal stationary position, the

combination with 'said'element of spring means connected with'said. element to constantly yieldmally disconnected rotative driving and driven clutch elements, an electric motor for constantly rotating the driving element of said clutch in one'di'rection while the machine is in use, means for at will temporarily connecting the-clutch'elements for a single revolution only of the driven clutch'elem'ent from a normal stationary position of the latter, and means operable on each such revolution of the driven clutch element to shift saidoperation-effec'ting element from the normal stationary position of the latter and against'the force 'ofsaid spring means and to thereafter leave said operation-effecting element disconnected from the driven clutch element.

lJInLa typewriting machine having an oper-' ation-effecting element oppositely movable from. and back'to a normal stationary position, the combination with said element of spring means connected with said element to constantly yieldingly urge the element into its normal stationary position, a single revolution clutch having normally disconnected rotative'driving and driven 1. In a typewriting machine having an operation-effecting element reciprocal from and to a normal stationary position thereof to perform its work, the combination with said element of a rack reciprocal from andto a normal stationary posi-, tion thereof, a mutilated pinion .rotative from a normal stationary position thereof to drive said rack in one direction of the reciprocating move ment of the rack and thereupon disengage from the rack during each revolution of the pinion, and key-controlled power-actuated means for rotating said pinion through a single revolution only upon each actuation of said means, said rack being normallyv disengaged from said pinion, and said elementand rack being constantly connected for concomitant reciprocation thereof from and to normal position and being constantly biasedto return to normal position. v

2. In atypewriting machine having an operation-feffecting element reciprocal from and to a normal stationary position thereof to perform its work and normally biasedto move to said stationary position, thecombintaion with said-elent 9f;afl messihlspqntml her ;as ns .-.rev.-,

clutch elements, an electric motor for constantly rotating the driving element of said clutch in one direction while the machine is in use, means for at -will temporarily-connecting the clutch elements-for asingle revolution only of the driven clutchuelement from a normal stationary position of the latter, and means operable on each such revolution of the driven clutch element to shift said operation-efiecting element from they normalstationary position of the latter and against the force of said spring means and to thereafter leave said operation-effecting element disconnected from the driven clutch element,

means for automatically locking the operation effecting element in its shifted position against return by said spring means, and means for at will releasing said operation-effecting element from the restraint of said locking ,means.

5.11:1 a typewriting machine having a support- 1 which is shiftable alternately to twopositions,

75, po t. from t iowermtom ts i her p si n. p in means for actuating said mechanism to impel the support from'its lower to its higher position, a locking device which is automatically operable to lock the support in said higher position and which is adapted to be tripped by said mechanism to free the support, a source of power for actuatin said mechanism to concomitantly free the support from locking action thereon of said I of reciprocating motion of the rack, a spring connected with the rack for driving the rack to said limit, a single-cycle, power means for driving the rack in opposition to said spring to a second limit of reciprocating motion of the rack and including a mutilated pinion which isnormally stationary and normally disengaged from the rack and which is coactive with the rack during each revolution of said pinion to engage the rack and drive it from said first to said second limit, and.

is rotative through 360 degrees only by each cycle of operation of said power means, means'for automatically holding the rack at said second limit of motion thereof when said rack is driven to said limit by said power means,,case-changing means shiftable alternately. to two casechanging positions in response to alternate movements of the rack to said two limits for condi tioning the machine in alternation for typing lower and upper case characters, and case-selecting means operable alternately to initiate a cycle of operation of said power means, and to free the rack from holding action of said holding means.

7. A typewritingmachine as claimed in claim 6, wherein the single-cycle power means comprises a rotary electric motor which operates constantly while the machine is in use, and a single-revolution clutch device having a driving member constantly rotated by said motor and any driven member connected positively with said pinion to rotate the latter and normally disconnected from the driving member, said clutch members being constantly biased to engage, and

wherein the case selecting means is alternately operable respectively to trip the clutch device for a single operation thereof and to free the rack from holding action of said holding means without tripping the clutch device.

8, A typewriting machine having, in com-bination, a type carrier support shiftable alternately to two positions, one higher than the other, to condition the machine for typing characters of difierent printing'case, a reciprocalrack having a one-way motion transmitting connection withv said support, for lifting the support from the means for automatically locking the rack against Iii lower to the higher of said positions, means for asoaoes the support into the lower one of said two positions thereof, said power means'lncl-uding a mutilated pinion which is normally stationary and normally disengaged from the rack and which is coactive with the rack, durin each revolution of said pinion, to drive the rack to said second limit and is rotative through only 360 degrees by each cycle of operation of said power means, locking driving thereof by said spring upon driving of the rack by said means to said second limit of reciprocation of the rack, and case selecting means operable in alternation to initiate a cycle of operation of said power means and to release the rack from looking restraint of said locking means.

9. A typewriting machine for typing characters of two printing cases having, in combination, a reciprocal rack biased to move in one direction of its reciprocating movement to a predetermined limit, a rotary electric motor which runs constantly while the machine is in use, a normally stationary mutilated pinion, a single-revolution clutch device for coupling said pinion with said motor for rotating the pinion 360 degrees only and thereupon automatically uncoupling said pinion from the motor and arresting it in its normal stationary position, the teeth of said pinion being normally out of the path of reciprocating movement of the rack and being engageable with the teeth of the rack during each revolution of the pinion to drive the rack a predetermined extent in the other direction of its reciprocating movement, case-changing means responsive to,

each stroke of the reciprocable rack, locking means for automatically detaining the rack in the position into which it is drivable by said pinion, and case-selecting means operable alternately to respectively put said clutch device into action and to release the rack from detention by said locking means.

10. In a typewriting machine having a main framework and a type support which is shiftable relatively to said framework to two limits, one higher than the other, for conditioning the machine respectively for typing lower case characters while said support is maintained at the higher one of said limits and for typing upper case characters while said support is maintained atthe lower one of said'limits, the combination with said framework and support of a reciprocal element having a predetermined throw, a spring connected with said element for driving the element to one predetermined limit of its reciproeating movement, power means transitorily operable on said element to drive said element in opposition to said spring to an opposite limit of its reciprocating movement, a toggle having an anchor fixed to the framework and a movable anchor positively connected with said element for lockin said element at its said opposite limit of movement against reverse driving by said spring, a second toggle having an anchor fixed to the framework and a movable anchor positively connected with said support for locking the support at its higher limit of shift against downward movement to its lower limit of shift, said element having a cam portion transitorily operable on said second toggle to initiate collapsing of the latter upon initial movement of said element by said power means and having a one-way driving connection with the movable anchor of said second .toggle for driving said anchorto lift the support from its lower; to its higher limit: upon driving of said element by said spring, a depressistantly energized while the machine is in use, a

type support shiftable up and down to twolimits 13. In a typewriting machine having workeffecting means reciprocal from and to a normal stationary position, the combination with said work-efiecting means of a control key therefor movable from a normal position to which it is 1 biased to,return, a shaft which is constantly power rotated while the machine is in use, a

mutilated pinion rotative about a fixed axis,

for case changing, a toggle connected witnsaid framework and support for straightening of the toggle for locking the support at the higher one of said two limits, a reciproca1 element operable on said toggle for lifting the support from the lower to the higher of said limits and for freeing said support for gravitation of the latter from the higher to the lower of said limits on alternate strokes of said. element, a spring connected-with said element for imparting support-lifting strokes to the element, means for transitorily connecting said motor with said element for imparting support-freeing strokes to said'element by power of said motor, a second toggle connected with said framework and saidelement for straightening of the toggle to lock said element at the end of each support-freeing against movement in supportlifting direction, means operable on said second toggle to free said element for driving by said spring, and case-selecting means for rendering the two last-mentioned means alternately efiective.

12. In a typewriting machine having a. reciprocal operation-effecting element, key-controlled power-actuated means to reciprocate said element comprising, in combination, a toothed-segment oscillative about a fixed axis and connected with said operation-efiecting element to, produce reciprocal movement of the element through oscillative movement of the segment, a spring constantly connected with said segment to drive the segment in one direction about its axis to a normal stationary position of the segment, a mutilated pinion rotative in one direction about a fixed axis parallel 'to that of the segment to, during each revolution of said pinion, first engage and drive said segment in opposition to said spring and thereupon disengage from the segment, means to normally lock said pinion against rotation at a single rotated position of the pinion in which said pinion is demeshed from the segment, a rotary shaft which is constantly power rotated while'the machine is in use, a control key biased to a normal position, and means responsive to movement of said control key from its normal position to eilect unlocking of said pinion and connect it with said shaft to drive the segment in opposition to the spring and responsive to pinion driven movement of the segment to disconnect the pinion from the shaft and efiect relocking of the pinion at the end of a single revolution of the pinion from its normally locked position.

a single-revolution clutch, responsive to movement of said key from normal position, to rotatively drive said pinion from said shaft through a single revolution and lock said pinion in a normal stationary position until said key is again moved from normal position, and a reciprocal rack in response to the strokes of which said workefifecting means reciprocates and with which said pinion transitorily meshes during each revolution of the pinion to drive said rack from a normal stationary position to which said rack is biased to return. 7

14. In a typewriting machine having an operation-effecting element reciprocal from and to a normal stationary position thereof in performing its work, the combination of ,a rack reciproca1 from and to a normal stationary position .to which it is biased toreturn, a mutilated pinion from which the rack is normally disengaged and which is rotativefrom a normal stationary position of the pinion ti) first engage the rack and drive it in opposition to its bias from its normal position and thereupon disengage from the rack during each revolution of said pinion, a

single-revolution clutch including driving and driven clutch members and a stop to disengage said members and arrest rotation of the driven member, power means for constantly rotating the driving clutch member while the machine is in use, means for driving said pinion from the driven clutch member when the latter is rotated, key-controlled means having a control key biased to a normal position, and controlled by movement of said key from normal position to both withdraw said stop from its arresting and clutch disengaging position and to engage the clutch members, means actuated by rotation of the driven clutch member to restore said stop to its arresting and clutch disengaging position prior-to completion of a single revolution of said driven.

CHARLES WALKER. WILLARD H. WADE. 

